Over the past few seasons, we have seen the plaid sport shirt skyrocket in popularity. While once men defaulted to solids and stripes, plaid is now a staple every man should include in his wardrobe. A plaid pattern that incorporates a bit of color adds panache when paired with jeans and rugged boots or trousers and wingtips. This fall, don’t be afraid to mix patterns either. So throw on a tweed jacket or a bold striped tie.